摘要：

用KMnO₄改性玉米芯生物炭，并用改性生物炭吸附水中的Cu²⁺和氨氮。结果表明：改性后，生物炭中的-OH基团数量增多且其表面有新生态MnO₂生成，吸附能力增强；生物炭吸附Cu²⁺、氨氮的最佳pH为7；共存Na⁺不影响生物炭对Cu²⁺的吸附，但显著影响对氨氮的吸附。生物炭对Cu²⁺、氨氮的吸附分别遵循准二级、一级动力学模型。Freundlich模型能更好地模拟生物炭对Cu²⁺的吸附行为，Langmuir模型能更好地模拟生物炭对氨氮的吸附行为。

关键词: 改性生物炭, 吸附, Cu²⁺, 氨氮, 动力学, 等温模型

Abstract:

The corncob biochar has been modified by KMnO₄, and the modified biochar has been used for adsorbing Cu²⁺and NH₄⁺-N in wastewater.The results show that after the modification, the number of the hydroxyl groups is in-creased and the fresh MnO₂ is formed on the surface of biochar, which significantly enhances the adsorption capacity of biochar.The optimal pH value for modified biochar adsorbing Cu²⁺and NH₄⁺-N is 7.The coexisting Na⁺has no influences on the adsorption capacity of biochar for Cu²⁺, but has significantly influences on the adsorption for NH₄⁺-N.The adsorption of biochar for Cu²⁺and NH₄⁺-N complies with the pseudo-second order kinetic model and the first order kinetic model, respectively.Freundlich model can simulate the adsorption behavior of biochar for Cu²⁺better.and the Langmuir isotherm model can simulate the adsorption behavior of biochar for NH₄⁺-N better.

Key words: modified biochar, adsorption, Cu²⁺, NH₄⁺-N, kinetics, isotherm model

中图分类号: 

• X703.1